spring-手动获取Bean的三种方式

世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。

public static void main(String[] args) {
		// 通过xml获取bean
		String xmlPath = "application-context.xml";
		ClassPathXmlApplicationContext context =
				new ClassPathXmlApplicationContext(xmlPath);
		BeanService service = (BeanService) context.getBean("beanService");
		System.out.println("xml bean : " + service);
		service.print();

		// 通过annotation获取bean
		AnnotationConfigApplicationContext aContext =
				new AnnotationConfigApplicationContext(Config.class);
		BeanService bService = (BeanService) aContext.getBean("beanService");
		System.out.println("anno bean : " + bService);
		bService.print();
		
		// 通过annotation扫描
		AnnotationConfigApplicationContext annoContext =
				new AnnotationConfigApplicationContext();
		annoContext.register(ScanConfig.class);
		annoContext.refresh();
		BeanService beanService = (BeanService) annoContext.getBean("beanService");
		System.out.println("scan anno bean : " + beanService);
		beanService.print();
	}

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